Validation in entity instance collection page

Question

I have a requirement where I have a page on our OPA interview page which collects entity instance.In this page there are two fields person contacted and contact date.I have to validate that the contact date is one per week.Please advice how can I achieve this requirement.

Answer 1

There is no standard definition, nor function for "the same week" - e.g. does that mean a week starts on a Sunday or Monday, or within 1 week in either direction?. In other words, you will need to express the specific logic you desire for "during the same week" in terms of the available functions such as those that can determine the day of the week and/or those that return the date plus/minus a number of days and/or the difference in days between two dates. Some suggestions on simplifying the logic ... two dates that are more than 7 days apart can't occur during the same week so only worry about <= 7 days apart, two dates which are the same day of the week and different dates can't be within the same week, so your logic should only need to deal two dates are different days of the week and are less than 7 days apart. In that case, you will need to express exactly what you mean by during the same week. (e.g. is a Sun and Sat that are 1 day apart within the same week or not?) Your logic should reduce to a rule table dealing with each day of the week and a range of days before/after that define "within the same week".